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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f34d6f3f815f3d24001fc468e6d91cf3a67beac21fe4f828e50296b56434d6' 
  AND token = '84zaALhdS6buqwdT6HCzb1xmoOxhjDWtxTNkmIzLypg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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