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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e844d87e8f24c4feb2e758acf3c654da0fd9a315746a761f8dd439fd0337de6a' 
  AND token = 'tRRvxzjBurul8cGPjUS6rm1s2P6DBnkgEX+eGcd6+IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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