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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbc931a5b9ee06d047c6e697ab34802b3d809ee1125ae8530229171bd9b68bf' 
  AND token = '/mdF4dsCACEP6pDJyCvjNXQUWwMPwvt9gaE35Vcqig4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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