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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e54dff5711f70f94e6f2c8fec9cc669aaf7d6658b9037e9ea75cbf327d5c1b80' 
  AND token = 'b39hrz3rmd/MfbY8IDf5ixJ0TMJnWgfV6az614m/2NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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