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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c4270e2df63d80442671164145b19a1629a03d1716fb9cd5f2aea894f685cf2' 
  AND token = 'dBHC8kd15t9TFTvlYP2VcnRcEWM3I0tBS1QVqRKtWig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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