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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a936550d21a310ded11d5834e55c81ad4fa8aadff8661300129cadf537f1ec2' 
  AND token = 'gRh4uZeNnfb16V5AmXHNPbgBi0dW0RKFckc/mC4CMag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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