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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff3e99f0d6e58eb7a7aa636472b78dd418f30de148f3f9e643e6d8fe843c6a2' 
  AND token = '55qx0pgA046xF7QjoNoNeWIEeD4oUg2QMN8i/wUCWnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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