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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a6f9297df83e36f13ba3fff130ee0ad4528039e94d596e8fe36f5fad0f16d4f' 
  AND token = 'SLWm2bjWRfhgmeGq/wfw/6v8phJXU2Nm1Zxj0FDsWMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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