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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a1460607da15ed4462d1c31fe65b988cd30e9de0e62b0de8ca050b80be132c2' 
  AND token = '9t9vbg+/NQ89j2d+i5+STC07CPhmKZ/pqyQaWRlff60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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