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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '805b555ca35656b9a8da7401256ee88ecdb253c6846e75a90de27088e90c6518' 
  AND token = 'dm1AFBqq1Qe3kLW3+eQ3eqSfkaxQmDxUgKdo++2Z2Mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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