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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f958ec467fcadef967de5e2345eb7230a7d8e52c7cd3a157dfd42208220a1b' 
  AND token = 'ZddAy9a2oT0ztOlFwSzH8MtmxkJy2TPRrYG5ur8W1ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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