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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856d8f8b71af987d9f79e1a298867ea5e69df2d3b1a36dfac662a987028059fc' 
  AND token = 'jwLo4zdAw2xbviDfiai25foUEJ2joZ934rl8yw2ddwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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