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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96cc4df39ad9ef7fd8b7d28135076fbc159605f1670075637a1af6474f70f5d' 
  AND token = 'S0Ew2DJprD9uJRW594BmsCSD2tEzmrhuCW17dTEXTNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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