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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8324e82aaba09ec2140b7ec1408d3e2a0c934b65cccb6b38b8afce62335630' 
  AND token = 'j19JdvpWmRE2KdalKjQkDDt0yEiQ34hJqol5KznAQWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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