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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347557b8c646bb686f6192a2f7bd1282410e428d0158281d6ea72d11dad9d6be' 
  AND token = 'pZp1QLLlhfOljTDfExBZmZJxAiApJbL0qJl+cqamQbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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