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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54b922f9d8319d9f2d3a760b06052fe44b783a70b473b935a4f1d3a31dd3087f' 
  AND token = 'KRtB8aMzIdngzO0C6C39cpgiYlgM97yWa0hJ/OO7fpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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