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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '466e83c0cee947b10682c5a084995483e933af079525217ad330f22ca4892061' 
  AND token = 'sZDcRcCVljn9a0Asv5kGaZ1EnYFGEF0JjAKyGFTGFjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}