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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0997c03029d64a9a97d3ee300847de5a4009f507e6a68c60f88a7ad98dc22d90' 
  AND token = 'BSU0i/+ZVcgyOB1TspCyYkQlCR5/x6OupL1wz7NCw8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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