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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c1e5f7b89ad6a24401c49d5829a004601593258cc08fd8be6e197d8ccf158f7' 
  AND token = 'TRFyLO4pEsdelA4mHQZ4xZkeuQROXC7I/IqRGR8VQV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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