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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5fb17d9046a2ee143fe8e3b458582badd268f461aa91988d317c4ef5a8bcfa4' 
  AND token = 'T9M57uBFNOyVldR+xwEcxSG5LCtXPYT2IB1hKII66d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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