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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87f4b3989a4520a2572fdb084ebb8e9de020b688128b16e17eeab9b22e8504c' 
  AND token = 'k2khhphtDidRbwnqfKFMC1aXhsUx2OLtIqW12Z43u8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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