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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd878dc1fb3f483be452703f29ced296b55a9b851e65a48dc5ec25ff0cef9e30' 
  AND token = '/I/cvHyJgd3pT13foLcwjQgWB+BQIj0Edbt3KaacLSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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