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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60af236b1f366aafb7e08004888f5b63c356f858819f86478c70110699445bf2' 
  AND token = '8XYb0fWB4RxqMEXPz8ORSobWYpSUOEbKIbfZe0ufN3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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