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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '706cd32061bf5feda1f13ebea3916771e9e6feb8b8e92537119f335a71459909' 
  AND token = 'd1NUQ/BOvr5qaZUHgObA04F82+gJku6UEnCjipaTht0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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