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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a504e56f7d3905efe490d26012b9eaea4eb620e38de77326a666a22ce83146ab' 
  AND token = 'yMmG1yMH8izuTAKzBtUpBYoiN+n6o2/dQ9YbG132j3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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