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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9f77a17e666ca7e90b2972c7d1e35a7cc5de05234964818f2dfd200faf4d957' 
  AND token = 'Zewjb9jtBq3uRz7uGoBRf1he/IiuM0+nc204LDrr1F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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