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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '214448ae6098069ea68e1c93bca16c173a193f26ecf43c84bfd8310cec22d812' 
  AND token = 'InRh3Z8YjxRJ3RffHIkMLp+BNfFhwrYG43PHbKy+tk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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