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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f7d9f95e6116fa737937348938682f5a690a9ad7a558c77a97e8dc97071e26b' 
  AND token = 'AtgFyJPo4uC7EeFIIh13E3zXXT09vIogo+ra80Xpo6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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