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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7cec1fbe3e70a5e9087ce90b285420dc633fb937332784dcbd8028ececfda3e' 
  AND token = 'XBhQWQH+R9KuG7Qs8zP+6rFF0XCWC+V1V6s75ecQwfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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