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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e362dfdd5630fe6d06f8081fbdb08e0f8dfd64c42321d7ab1e23144a202913' 
  AND token = '82+9xFX7i5Obw0O/GSu5kEiQkhPHAusqJ7OpZx/JETo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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