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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f5481dab1a8b0fe2ba5e6e2e613d632c014e0b7435507fe834317422107871' 
  AND token = 'alvHBVzKtE3QjqNNRgXoICy+oPi3CSVcQVRElqQGeh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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