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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e1682e5543ce345315822629b6ca7163c379d5da5976a8c78ec4dfed4463ac' 
  AND token = '9l7+fIATJyP1gDyM+7OKN49wZmXHncChcclwLTZ68A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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