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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01627f8cb7feb8775d0bcf8f0b9dfa0d49ec2360c2e53b98f06168873a8b2cf4' 
  AND token = 'mj8pVQD+Rl0Lqyeu+GxHz8Byp5t36eKYGOaZpsj1Vc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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