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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3680c572968081b5403b98aa6b1c00fd3a42f957714fb28b533d31b5b09d9f88' 
  AND token = '5xy28Xb7qJCEvG4P5PS4PHi41nBD/utRkI8OR4mV7EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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