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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e8ce1727d2a0dc8700831fee792e118d24eca5c8de0666bff41129c9026c28' 
  AND token = 'kd8oklxukQwbOPtDmVy1O62IhWwja/IdrzixyEz3rb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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