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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c1bac61ca841cd05881bed7f010307dc7367f3525de436f280dc8001bc8663' 
  AND token = 'vhHw601W6imJLvP5/38ucGy5W8Dt0yAZq4ubWE77ilc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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