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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9efbba3faef0dd31c0ecd9431602e4c8a0a0912fa1f4aa058f61598e431b7ab0' 
  AND token = '/kLrCN/ZrFbpl6UfKPMhTR/AYjfcRBuc7QGEddM7Kdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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