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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c03b9caffcd481691b035cce1d3c9f13a82e63f2f66146fac460c1e5fa2aba' 
  AND token = 'q0t1ZqRZ+JiY62qPUPm1pPpCOwpfXXW3INw0rkG1WW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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