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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7db90919c1759a562a20eb00a35a495dee54c83b00b8f949c27a04575846ad2' 
  AND token = 'aw75BEQBcAgXICkYv3rgjXBMg26ZEvY9cEGCAacUpL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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