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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa471357bf194cde08d3dad310a30989fcba2780d1caebcde7a29e2bd196aeb' 
  AND token = 'Ns78i4TMHOAUZm5vaAAs8O5HPDqcSv3eiOMHI7WiEgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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