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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9da4616643144967120330f026a247e26141b0f4ed82a331360e811e252adf7' 
  AND token = 'rtnL3Ipso4h6nN3TVXdO4+5LqKv6ZU2oaK9dQHxzxzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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