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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f0ca7a6aa3dc7d866235b1522a1e306ebef9bd52676e7ee9bb31d4c9f4adcf0' 
  AND token = 'vnSLWakWtRr8kxIFM4kx6SB1oayHLq4PL4d/uI5DeKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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