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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62a53e22c39b6d044d04afc8b31dcbbf0fa18442782900a6a3c43cad9a74f84' 
  AND token = 'tsj26lA4FUot2n8n0oUGIR+SvT7XMlVreeaBOaDcLbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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