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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86dd9007aeea6f259f8a3d536dfbf6b8cf3beddc9666b05429b6dc4fd2d95fb6' 
  AND token = '6ejT4TH1n/8q8McnxvSXjHhvja/UEIbrDZQNGxCmzsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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