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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62803f4cca312ac089b75d2b565e4169d1ed31f0f4d681c973ae896fd445f517' 
  AND token = '1G5buYZtbpidcP5iGnMTIxeL25XRkL6n/hnsVMZeF5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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