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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9459fc4351f5848e87210e5ad14c1b130bbacca3cf33c16910cdf606f537b8' 
  AND token = 'b83Znf2NPoetnhfTfNKnrNmBeFspo1Q3wpZ1I0RCjRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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