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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285d4b6415f09649f36e70dc8efa9771cfefa023eb26cdc5c4d2d20bead7ce60' 
  AND token = 'R+9zj2TH03hmwzeJ/vqzamrkLpl1GC+7nNmsj1vMfl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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