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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30903b2461d97cf29d126da40852668be311271cd507ac973f206e4916a0c5cb' 
  AND token = '8HKMhEQi4bvbMkhF7kRVMLgPzzAIsk4XujgIo9LgQG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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