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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be5f5a1603f3df078b70dddce5da12742c547f646b5a3095ed7ff1b5e3fe43f' 
  AND token = '7uv47g2cwOeiIGBJmH2aa+Vpv0VR4sWJq37VbQth16s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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