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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df1bd2063426fc91c71f1892b5d4c7095f563c1f7a79cbec82e9cf3a330780b' 
  AND token = 'TemEmfhBy2e9MN17IMXvowhPiy4PTN7ozfG1bGvbeQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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