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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f6188e929ade1a59fd5fd7324d239177c7abbdc72c4d1eebf198991a169ef9' 
  AND token = 'haKThF9TJHyL8i9ZDhA9jwJ/SIRIb627gzt3j3W0tAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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