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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6295f267c90d156d3f5bc1d1343b1d2d3c223811cb20f92df6c5280d34a6514b' 
  AND token = 'YKB+Pq37erC/PUGpjakrdwWpo9QEO6aCSErBlWddSws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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