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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd23ecf256eadd2463df595589e4719b6bd6a4bdfbf17e78811b2a9f4d1727f0' 
  AND token = '90nLqeUB7mRbxhBoetuEzKhUJ2fAXS79OZ8YOcXl9gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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