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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cbe90d14be00ef4debb83b775a1f97ef1a21a17bd44e63582bc04bb1c2eb847' 
  AND token = 'gNLhrTAeNeDTki3KPmJ/sxY9eNwc0S+mMRVt3ktvn60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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