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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ec060cc72121d9a652c51d2951e393952aa0061c081ca3363a580a1e2b6038' 
  AND token = 'zYvN4aM/IbRZQM82dU4XB0AZqTmmABTCwavqG9UNxpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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