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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '034dbf29ef512bca8d431ccf39a569f00b6a599e7056d3e3fef4f53bdb1c15c3' 
  AND token = 'uMn/jP51fGAn2WjVZucYQlGSRXeUyga4mvNv0fUDLRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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