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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153dbefce28777a6933f7dd9a72779dee3be176f52747c6b41aa0c7751a9054d' 
  AND token = 'qFQ1paRGcGqs34nI++qkbs+M1x/2q38pAO1Sssqi9PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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