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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a0bb41249c634952b0d3e9b7d5cc1ab206785d34cf1e1d1bebc45a14bec297' 
  AND token = 'Xfqbo6uvjEo59AeRJowJXOjF+8nssrjaCQQgYniNmGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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