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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62711ec1dd5828f803d18f9ea9fc502a4204da1388ecb63405ba54cb33c1f57c' 
  AND token = '/PH67miiPvl0IDgW9RImqdm08E/YF0K3K+KLSvm4ajU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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