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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0da85e20486bdcd5b88c0e5edb5db22cf6f620ec08b83ed655d88bcf894009b' 
  AND token = 'OijH7S1He2ZGMi+tculb3XV5a8pUX5Fb7jQdkFlk8s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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