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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97717d7792da977e62098f1f7458d83e3615291ca9ea14389ce0f9bde38a0722' 
  AND token = 'Rup07IKe9ftkZKuyTsyVW+oImrCOElJsR+aqT6FCgB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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