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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70455923ded673f798f0126a43165b02e8ede3bc50573854ce059abea5a3e3f5' 
  AND token = 'dvnCVDXYFAQVYj8sK7Q7ClLl/zuwZmWNs3TNtvgEEeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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