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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e2bc2ff249d987e35352a67a432e4c630dcdf35527ff312869caced8f242aa7' 
  AND token = 'm6+48JavmRn6okAzu76bnW5+N9vh0IX3DMgU/7hvAZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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