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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09708bb43a327ec2b770c2b65635a69555eeb10bc4438e8ed93cd341c3cb9029' 
  AND token = 'wWFQP37MhVyNY4w3H2bn/mHOhXpxPuqLtT7k+zOSMBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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