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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd490489daf3e0b2d3cfda468f60b0e200a9948b3f3a5ec9713a2c3ec7b848a17' 
  AND token = 'VbULjOVGqzDbUXkPXdDbsA87fkcU3IMap5s+tNUsXAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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