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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2f6a9553b1c623e450c5dd2e27c584effe7f0193bbeac477593243811e937f' 
  AND token = 'INcWmjUgKVZxDsa0jdgZ0zigI7oiyyoYSg6fRQsNtd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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