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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff0d097447b68ddb0e6689d545ed31a608d1a43d13885aef4281fe2c812553d' 
  AND token = '63xVsY7XFAIhWQ5GGGIDDRwxFWo8Loil/OBuHtGh5ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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