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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea787e258ea33f84649828a582bfc641d3e98c473f1a0d66d2d5ba440a9ab43e' 
  AND token = 'BY4RhnG7O/v21iq1kt7fQUGNA7lpHZciFSUgYjyp9cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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