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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b812889ff9184bbd6f65aa2f4f7b312e921bd5c3822acca263088850dc8b53b0' 
  AND token = 'chs2o+8HHCUZAhgoN/eJzjX1C/Rug1EDygNreETjVAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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