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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a70d0b96de0ec00a800d24e4f3fc5d01950d48bad55478c939f4fd2e9812527' 
  AND token = 'E9aET/KI98Fm+7JW4gEL9Jp6H1VveamRvQ9YG7D2vJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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