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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7003396c6cdca288a1f9787ec802a936f252eac564c3a93536e097a9877896c4' 
  AND token = 'mRnwMhSnNm+NQz1vVq/zInA8CY1P59IWOgF8uOya1z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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