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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61e0d9879dd5fe6a1928e59e8709f652973982d5cc78e9b88931aaa56b00b4d' 
  AND token = 'TraVsY3+2gQFN4daqRclTddk8F4O3ntDMC7m+w3EsvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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