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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a4b7ef866d23088a0ab3329ac66544d5d6a6ec4f90e787b2c3f3d05f678f23a' 
  AND token = 'AzLtONOJAF8yvhN9wHuTUym/hENI02KkS0NwCN8H878=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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