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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2385de82c26c99987c5d5425fbbedc2358d6ed3e175f80f3bb9b8836d367d3d7' 
  AND token = 'h7unaMeY2T34Ijrm3sdwKd9wAmca+pfEp4Ex45baueI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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